1. Laws of Motion
Day 2

2. Review…
A full coffee mug has a mass of 0.60 kg and an empty coffee mug has a mass of 0.30 kg. Which mug would have a greater acceleration if pushed with a force of 3 N? Why?

3. Sammy Sosa hits a 0.15 kg baseball and accelerates the ball at a rate of 30,000 m/s2. How much force does Sosa exert on the ball?

4. 1st Law of Motion – Law of Inertia
You’ve always heard: “An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force” NOW it’s the same concept, but the vocabulary has changed “An object will have a constant velocity unless acted upon by an outside force” What is constant velocity?? Constant = the same, not changing Velocity = speed with direction Constant velocity = moving at the same speed

5. F = ma 2nd Law of Motion F = ma could be written two other ways.
Solve for “a”.
Solve for “m”.
What relationships do you see?

6. 3rd Law – Equal and Opposite
When the air escapes and pushes down, there is an equal and opposite reaction and the balloon pushes up.

7. More 3rd Law: Equal and Opposite
Law of Conservation for Mass and Energy =
Neither mass nor energy can be created or destroyed .
The mass and energy that you start with has to equal the mass and energy that you end with.
ma = ma

10. mA = Ma
Does the car or butterfly have a bigger mass? Who experienced a larger acceleration? Who experienced a larger force?

11. m1a1 = m2a2

12. A 1000 kg steel ball is used to strike a 50 kg stone block causing the block to accelerate at a rate of 20 m/s2. Determine the rate at which the ball accelerates as result of hitting the block.